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It’s basically a tool through which you can issue shell commands via your computer to your phone. ADB stands for Android Debug Bridge. It comes as a part of the standard Android SDK, which you can grab here. Basically, it provides a terminal-based interface for interacting with your phone’s operating system. Since Android platform is based on Linux, command-line is the only way to obtain and manipulate root access often required to perform certain advanced operations on your device using root access.

You can also directly issue commands by installing a terminal applications like terminal emulator, but it’s not handy to execute complex commands on such a small screen.
So, want to get into the android era?

So, first step is to get the android SDK on your computer from here. Just download the installer and install it to any drive, in this guide I am installing to a folder called android in C drive i.e (C:\android).

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after installation has completed just click finish and it will automatically launch the SDK Manager. Now select both the option i.e platform tools and SDK tools and accept it and click Install. Once the process is done, you will have a ‘platform-tools’ folder inside your (C:\android) folder. That folder will have your ADB and all its dependencies.

Now, set the path variable. So, that you can easily issue commands via any location in cmd.To make ADB along with other Android SDK tools and platform tools easily accessible from anywhere at the command line, we shall add their paths to the PATH environment variable.

Right-click on the ‘Computer’ icon and click ‘Properties’. Now click ‘Advanced System Settings’ from the options in the left pane to bring up the ‘System Properties’ window. In the ‘System Properties’ window, click the ‘Environment Variables’ button on the ‘Advanced’tab.

Go-to the ‘Path’ in the ‘System variables’ section and double-click it to edit it and click on the text box and bring the cursor to the last.

Just add the below lines at the end of it, including both the semi-colons:

;c:\android\tools;c:\android\platform-tools

Note:If you have installed the SDK’s contents to another directory, make sure to use that one for your PATH variable.
Notice that the semi-colons are necessary to separate each path variable entry from the next and previous ones.

Click ‘Install Selected’ and in the window that pops up, click the ‘Accept all’radio button followed by the ‘Install’ button. After the installations completed. The drivers for both 32 bit and 64 bit systems will now be present in the SDK(C:\android) folder under ‘usb_driver\x86′ and ‘usb_driver\x64′ sub-folders respectively.